ltc6993-1 Linear Technology Corporation, ltc6993-1 Datasheet - Page 14

• Manufacturer Part Number: ltc6993-1
• Description: Electrical Specifications Subject To Change
• Manufacturer: Linear Technology Corporation

LTC6993-1/LTC6993-2
LTC6993-3/LTC6993-4
operaTion
Monostable Multivibrator (One Shot)
The LTC6993 is a monostable multivibrator. A trigger
signal on the TRIG input will force the output to the active
(unstable) state for a programmable duration. This type
of circuit is commonly referred to as a one-shot pulse
generator.
Figures 3 details the basic operation. A rising edge on
the TRIG pin initiates the output pulse. The pulse width
(t
tor (R
edges on TRIG have no affect until the completion of the
one shot and for a short rearming time (t
To ensure proper operation, positive and negative TRIG
pulses should be at least t
The LTC6993-2 and LTC6993-4 allow the output pulse to
be “retriggered”. As shown in Figure 4, the output pulse
will stay high until t
Successive trigger signals can extend the pulse width in-
definitely. Consequtive trigger signals must be separated
by t

OUT
RETRIG
) is determined by the N
SET
) connected to the SET pin. Subsequent rising
to be recognized.
OUT
TRIG
TRIG
OUT
OUT
after the last rising-edge on TRIG.
WIDTH
DIV
Figure 3. Non-Retriggering Timing Diagram (LTC6993-1, POL = 0)
t
t
Figure 4. Retriggering Timing Diagram (LTC6993-2, POL = 0)
PD
PD
setting and by the resis-
wide.
t
t
t
WIDTH
OUT
OUT
ARM
) thereafter.
t
RETRIG
t
t
PD
PD
t
WIDTH
t
OUT
Negative Trigger Versions
In addition to the retrigger option, the LTC6993 family also
includes negative input (falling-edge) versions. These four
combinations are detailed in Table 2.
Table 2. Retrigger and Input Polarity Options
Output Polarity (POL Bit)
Each variety of LTC6993 also offers the ability to invert
the output, producing negative pulses. This option is
programmed, along with N
(The previous section describes how to program DIVCODE
using the DIV pin).
t
PD
LTC6993-1
LTC6993-2
LTC6993-3
LTC6993-4
t
OUT
DEVICE
t
ARM
t
OUT
t
PD
t
OUT
INPUT POLARITY
Rising-Edge
Rising-Edge
Falling-Edge
Falling-Edge
DIV
, by the choice of DIVCODE.
69931234 F03
69931234 F04
RETRIGGER
Yes
Yes
No
No
69931234p